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Thanks so much, this is the plug from my machine which appears to utilise the end pins like in your picture, is that what you mean? Should I look for a psu that has a similar pin label to that ?

this is what i mean, some have nothing on the end pins, some have 12v

there are differences between supplies, its usually the end pin, some have 12v on them, some have something else, so the trick is to make sure your machine doesn't use the very end pin then they work, as for the models that this happens with i cant remember now

Hi, I have a Scorpion 4 machine with a failed PSU (makes a really loud humming noise and does'nt power the machine correctly). The PSU is the Sanken GSK017HA 44v. About a year ago I took a gamble and bought a 44v Sanken SPS077W hoping it would work as the connections are identical. However, it didn't light up the machine. It just made a loud whining noise, I assumed that this PSU isn't compatible and left it hoping to come across a 2nd hand GSK. I've come back to it this week, and discovered the the replacement I bought makes this noise even when its not plugged into the the machine. So my question is: Did i buy a faulty PSU and just assumed its not compatible, and are these 2 PSU's actually inter-changeable? Thanks,

Welcome, we’ve had loads of people called Gary join today 😅 when you inevitably try and comment, but unable to reply, pls change theme of page by scrolling to bottom. This is a common issue for years now

Hello and welcome to the forum. There's many good people on here.

Hi, I'm Gary looking for some fruit machine advice and parts for my Star Wars a new Hope club machine Happy to help out with any information and support the forum.

Hi, I'm Gary looking for some fruit machine advice and parts for my Star Wars a new Hope club machine Happy to help out with any information and support the forum.

Hi, I'm Gary looking for some fruit machine advice and parts for my Star Wars a new Hope club machine Happy to help out with any information and support the forum.

Hi, I'm Gary looking for some fruit machine advice and parts for my Star Wars a new Hope club machine Happy to help out with any information and support the forum.

Hi, I'm Gary looking for some fruit machine advice and parts for my Star Wars a new Hope club machine Happy to help out with any information and support the forum.

Hi, I'm Gary looking for some fruit machine advice and parts for my Star Wars a new Hope club machine Happy to help out with any information and support the forum.

Hi, I'm Gary looking for some fruit machine advice and parts for my Star Wars a new Hope club machine Happy to help out with any information and support the forum.

Hi, I'm Gary looking for some fruit machine advice and parts for my Star Wars a new Hope club machine Happy to help out with any information and support the forum.

Thanks for the pictures, will be great for emulation purposes. I can dump the ROMs for you if needs be.

Well, one of the functions that IC24 does is to monitor the lamps for short circuit bulbs and turn off that bulb as a precaution. It does this by monitoring the voltage dropped across the mux voltage feed resistors. This is fed into a little two transistor sensor circuit which then puts a signal on pin 10 of IC24. In this case both the transistors were iffy and the signal on pin 10 was constantly low. This is then fed back to the CPU which told IC12 to send permanent wait states up the CPU's own backside! Both transistors (T68, T69) had black legs and the BC337 (T69) tested leaky. Once swapped out along with the 5.1v zener as a precaution IC12 didn't send any more pulses on pin 7 and you could see the lamps at full brightness along with all the switches now working. To say I was relieved was an understatement.

Come on Bob, put me out of my misery 🤣

Room these on my phone hope they can help , if the Rom works then someone will need to dump it

Maybe dump the roms and some hi res pics as don’t think we’ve this version emulated yet

Well done Bob the old grey matter is still razor sharp .

I can't believe it's been over a year since the last thread but this one was a corker! This board had been to & fro quite a few times with various faults but this time it was just 'stuck in RESET'. That proved to be easy as the little voltage supervisor chip had failed. Thinking it was ready to go back, testing it the next day proved otherwise. It was now running slow, dim lamps, and the Start switch wouldn't work? 3 days later and swimming trunks at the ready for the jump in the Thames I was geting nowhere! For those who follow this thread may remember this is very similar to a fault a few posts back and this was due to IC24 (8255) which had failed. The plot somewhat thickens here as an old note stuck to the bottom of the board had all these symptoms on it and a previous repairer had alread been around that area changing chips obvioulsy to no avail. All these had to be removed as they needed tidying up and I couldn't be sure there wasn't something untowards underneath them. So once that done the same issues were still there. So what is causing the problem. Well, as was described in the previous fault, a pulse coming from IC12 (7) puts delays in the NMI line to the CPU which is used for various functions. I'm thinking it must be something to do with IC24 as it controls the lamp multiplex and the switch multiplex, but what? The chip is OK as it's already been replaced. Whilst in bed last night it came to me in light bulb moment and this morning I found it straight away. I was correct in my diagnosis that it was something to do with IC24 but up and until then didn't understand why. Now I do. What caused the issue? (just two components)

A little update i have hopefully got the 10p roms coming later this week i will let you know if they work ok

Thanks Nick I will give it a go 👌

20p - glass wouldn’t match. 10p would allow glass to match.

Thanks I will take a look